“…During World War II and after, the Black Hills were a locus of numerous investigations by the United States Geologic Survey (e.g., Fisher, 1942Fisher, , 1945Gwynne, 1944;Noble and Harder, 1948;Noble et al, 1949;Sheridan et al, 1957;Norton et al, 1962). Previous mapping of the study area was conducted by Norton (1976). Mapping adjacent to and within close proximity of the study area was conducted by Redden (1963Redden ( , 1968, Ratte and Wayland (1969), Bayley (1970, 1972a, 1972b, Woodland (1979).…”